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I distinctly remember seeing an ad for a string piano that had electronic piano actions driving the hammers with solenoids. I am not talking about a digital piano with hammer weighted keys for "feel". Nor am i talking about systems that are intended to control a piano with standard mechanical repetition actions like the Yamaha Disklavier, PianoDisc or QRS Pianomation. This action actually replaces the entire mechanical repetition with an electronically controlled solenoid that powers the hammer onto the strings.

I dont remember where I saw it, and cant seem to track it down with Mr. Google. Does anyone know who makes/made such a thing?

I also wonder if you can buy those actions, key sensors and control circuitry without having to buy the whole piano, for use in another instrument.

That's not it. I swear that i saw an image of a piano hammer and flange attached to an electronic driver mechanism. There was no repetition. I dont know if it was ever a commercial product. Its not something that you would retrofit onto a traditional piano. Its more like something that you would use to make a keyboard-less string piano module controllable by any MIDI signal.

McAfee is a terrible program. The guy who created it is on the run for murder, a really shady guy (although he doesn't run the company any more).

It is designed to make you think you're in constant danger so you will continue to give them money. Cancel your subscriptions, uninstall the software and get something decent. I recommend Microsoft Security Essentials (it's free, unobtrusive and I've not had any issues since I installed it). Also, if you are using Internet Explorer, switch to Firefox or Chrome.